fix: remove autoprefixer again temporarily due to unavialability of node??! and miniracer block because of panter-rails-deploy

Resolve "Neue Top Menu Punkt Halbjahresfeedback"

Closes #447

See merge request !815

Switch Gilab-CI image and the Gitlab-CI config

See merge request !818

fix(autoprefixer): get back autoprefixer by using Node as execjs env

See merge request !817

Fixes/solve list responses verify buttons redirect problem

See merge request !814

- it doesn't reload the page
- it shows model save errors as list
- it renders json response from the xhr action to template passed to api_button
  - using lodash tmplate

Merge branch 'features/list_responses_has_journal_create_link_with_citation_of_feedback_in_journal_entry' into 'develop'

Features/list responses has journal create link with citation of feedback in journal entry

See merge request !813

Features/clock symbol link to hours for list responses feedback

See merge request !812

comment flappy test: Volunteer state inactive filter returns inactive volunteer

See merge request !810

guard the case when a group offer has a creator (actually responsible) that has no profile

See merge request !809

fix the relation volunteer group offer not excluding deleted group_assignment

See merge request !808

Merge branch 'fixes/submit_half_year_feedback_does_not_work_because_of_client_having_invalid_permit_entry' into 'develop'

Fixes/submit half year feedback does not work because of client having invalid permit entry

See merge request !805

Fixes/volunteer rights on ending assignment evaluation

See merge request !806

More extensive tests for volunteer with billable hours

See merge request !804

- the correct policy for update_terminated_at method
- order the policies for methods
- allow long lines for policies in rubocop
  - so that policy statements can be lined up in a more readable way

fix wrong date between scope for with_billable_hours and hours semester scopes

See merge request !803